Digital directional coupler



FIG. 1 is a top plan view of a digital directional coupler showing a new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a left elevational view thereof;

FIG. 5 is a right elevational view thereof;

FIG. 6 is a rear elevational view thereof; and,

FIG. 7 is a perspective view thereof. 

The ornamental design for a digital directional coupler, as shown and described. 